You should compute your taxes both ways and file whichever way results in less tax. Filing jointly is usually better for the taxpayers, but not always.
A possible complication is that you file jointly (have to make an election) the US will tax your world-wide income not just your US income. If you don't have a lot of foreign income that won't matter.
For more info see:
https://www.irs.gov/individuals/international-taxpayers/nonresident-alien-spouse
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